Phil Leigh;654391 Wrote: > Something was very wrong with your test procedure,or your sound > card/drivers. Via s/pdif, both FLAC and WAV/PCM always give 100% > identical (correlation null = -144) comparisons with the original rip > file. > > However, for this to work you do need a sound card that is not being > (ahem) "managed" by the operating system... e.g. no Windows kernel > sample rate conversion weirdness... > > By the way, this test actually tells you nothing about what happens > when you connect a DAC to the Touch s/pdif... it simply proves what we > already know, namely that both wav and flac playback are "bit-perf > ect" via s/pdif. > > Noise from the transport can IN THEORY still interfere with the > operation of SOME DACs - likewise, jitter and clocking can still be an > issue for SOME DACs.
I haven't got the time or energy to try again right now, but the results were consistent over a couple of runs. I was using an M-audio 24/96, external sync. The results were not exactly the same as the original. Comparing the rip to itself I got a correlation of 300 (as below - I kept that one for reference) parameters: 0sec, 0.000dB (L), 0.000dB (R)..Corr Depth: 300.0 dB (L), 300.0 dB (R) I don't know why I get 300 and you quote 144. Maybe a different version of ADM? Mine is 3.22. I'm using M-audio's own Windows 7 64 bit drivers. During the runs it said I didn't need sample rate compensations, so I didn't. Something of a mystery then. I don't have an external DAC (see signature below) but was running with SPDIF into the sound card since I thought it might tell me something interesting. -- PasTim Server on Windows 7 Ultimate 64 bit, 2 CPU, 2GHz, 4GB, FLAC files. Touch on Ethernet (in another room). Analogue out over 'a bit of wire' to ageing Quad Hi-Fi. An old (wireless) laptop controls the server using Chrome. ------------------------------------------------------------------------ PasTim's Profile: http://forums.slimdevices.com/member.php?userid=41642 View this thread: http://forums.slimdevices.com/showthread.php?t=87973 _______________________________________________ Touch mailing list Touch@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/touch
